HHH-13334 - attribute converter add mapping of Java Byte type to JDBC TINYINT type.

hibernate-core/src/main/java/org/hibernate/type/descriptor/sql/JdbcTypeJavaClassMappings.java

@@ -103,6 +103,7 @@ public class JdbcTypeJavaClassMappings {
 		workMap.put( BigDecimal.class, Types.NUMERIC );
 		workMap.put( BigInteger.class, Types.NUMERIC );
 		workMap.put( Boolean.class, Types.BIT );
+		workMap.put( Byte.class, Types.TINYINT );
 		workMap.put( Short.class, Types.SMALLINT );
 		workMap.put( Integer.class, Types.INTEGER );
 		workMap.put( Long.class, Types.BIGINT );

hibernate-core/src/test/java/org/hibernate/test/converter/ByteEnumConverterTest.java

@@ -0,0 +1,150 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.converter;
+
+import java.util.Map;
+import java.util.HashMap;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Convert;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+import org.hibernate.SessionFactory;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+import org.hibernate.metamodel.spi.MetamodelImplementor;
+import org.hibernate.query.Query;
+import org.hibernate.type.Type;
+
+import org.hibernate.testing.TestForIssue;
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Vincent Sourin
+ */
+@TestForIssue( jiraKey = "HHH-13334")
+public class ByteEnumConverterTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class[] getAnnotatedClasses() {
+		return new Class[] { Photo.class };
+	}
+
+	@Override
+	protected void afterEntityManagerFactoryBuilt() {
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Photo photo = new Photo();
+			photo.setId( 1 );
+			photo.setName( "Dorobantul" );
+			photo.setFileType( FileType.TYPE2 );
+
+			entityManager.persist( photo );
+		} );
+	}
+
+	@Test
+	public void testEnumWithByte() throws Exception {
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			//tag::basic-attribute-converter-query-parameter-converter-dbdata-example[]
+			Photo photo = entityManager.createQuery(
+				"select p " +
+				"from Photo p ", Photo.class )
+			.getSingleResult();
+			//end::basic-attribute-converter-query-parameter-converter-dbdata-example[]
+
+			assertEquals( FileType.TYPE2, photo.getFileType() );
+		} );
+	}
+
+	//tag::basic-attribute-converter-query-parameter-object-example[]
+	public static enum FileType {
+		TYPE1((byte) 1),
+		TYPE2((byte) 2);
+        
+		private byte id;
+    
+		private FileType(byte value) {
+			this.id = value;
+		}
+    
+		public byte getId() {
+			return id;
+		}
+    
+		public static FileType getValue(byte value) {
+			return map.get(value);
+		}
+        
+		private final static Map<Byte, FileType> map = new HashMap<>();
+		static {
+			for (FileType s : values())
+				map.put(s.id, s);
+		}
+	}
+	//end::basic-attribute-converter-query-parameter-object-example[]
+
+	//tag::basic-attribute-converter-query-parameter-converter-example[]
+	public static class FileTypeConverter
+			implements AttributeConverter<FileType, Byte> {
+
+		@Override
+		public Byte convertToDatabaseColumn(FileType attribute) {
+			return attribute.getId();
+		}
+
+		@Override
+		public FileType convertToEntityAttribute(Byte dbData) {
+			return FileType.getValue(dbData);
+		}
+	}
+	//end::basic-attribute-converter-query-parameter-converter-example[]
+
+	//tag::basic-attribute-converter-query-parameter-entity-example[]
+	@Entity(name = "Photo")
+	public static class Photo {
+
+		@Id
+		private Integer id;
+
+		private String name;
+
+		@Convert(converter = FileTypeConverter.class)
+		private FileType fileType;
+
+		//Getters and setters are omitted for brevity
+	//end::basic-attribute-converter-query-parameter-entity-example[]
+
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public FileType getFileType() {
+			return fileType;
+		}
+
+		public void setFileType(FileType fileType) {
+			this.fileType = fileType;
+		}
+	//tag::basic-attribute-converter-query-parameter-entity-example[]
+	}
+	//end::basic-attribute-converter-query-parameter-entity-example[]
+}